How do I get rid of a redirect loop on one of my multisites?

I have a multisite, pro sites on my main site. I have multiple sites now configured and operational on this multisite application. I have one site that is experiencing a redirect loop when you try to access it.

This is happening for everyone, on different computers, different browsers at different times. so it is not a browser cacheing issue.

I had this problem in the beginning, with several of the sites, although not with this one in particular. I resolved it by deactivating the membership and pay per view plugins until they were ready to be configured. However, these 2 plugins are deactivated on this site already.

This is one of my main guys, I am hearing about it from his visitors. Please help me fix this asap. Thanks in advance for your help! Linda @iempoweru